668965569866 has 16 divisors (see below), whose sum is σ = 1094725912320. Its totient is φ = 304059986880.

The previous prime is 668965569829. The next prime is 668965569931.

It is a happy number.

668965569866 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×668965569866² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309626 + ... + 1197413.

It is an arithmetic number, because the mean of its divisors is an integer number (68420369520).

Almost surely, 2^668965569866 is an apocalyptic number.

668965569866 is a deficient number, since it is larger than the sum of its proper divisors (425760342454).

668965569866 is a wasteful number, since it uses less digits than its factorization.

668965569866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1527229.

The product of its digits is 6046617600, while the sum is 80.

The spelling of 668965569866 in words is "six hundred sixty-eight billion, nine hundred sixty-five million, five hundred sixty-nine thousand, eight hundred sixty-six".